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(No Model.)

H. s. DICKINSON. 5

GHIMNBY GAP. No. 310,391. Patented Jan. 6. 1885.

" lllll UN TED I STATES PATENT OFFICE.

HENRY S. DICKINSON, OF JERSEY CITY, NEW JERSEY.

CHIMNEY-CAP.

' SPECIFICATION forming part of Letters Patent No. 310,391, datedJanuary 6, 1885.

ApplicatiOn filed June 23, 1884. (No model.)

To all whom it may concern.-

Be it known that I, HENRY S. DICKINSON, a citizen of the United States,residing in J ersey City, Hudson county, New Jersey, have invented acertain'new and useful Improvement in Chimney-Caps, of which I declarethe following to be a full, clear, and exact description, so that anyperson skilled in the art or science to which it appertains can make,construct, and use the same, reference being had to the accompanyingdrawings,which form part of this specification, and to the letters andfigures of reference marked thereon.

The invention relates to chimney-caps, and has for its object theprevention of backdraftsin heavy winds and the securing of a certain andunobstructed draft at all times. It consists of the arrangementhereinafter de scribed and claimed, and is an improvement upon thechimney-cap secured to me in Letters Patent of the United States No.299,628, granted June 3, 1884.

The accompanying drawings represent my improved device. Figures 1 and 2are sectional views on the lines 1 1 and 2 2.

Like letters of reference indicate like parts.

A is the flue, that is fastened to the chimney-top inany suitable way,so as to form a continuation of the flue of the chimney. It issurmounted by the cap B, which is pierced by the transverse tube 0. Thetube 0 is open at both ends-to wit, at a and b. It is horizontal. Whenthe wind drives into the tube at either end,it has a clear coursethrough the tube and out at the other end. This tube 0 is cut throughalong its roof or upper part, thereby forming the opening d, throughwhich communication is had with the interior of the cap B. This openingd is the only opening from 0 the interior of the cap B into the tube 0.Vith the arrangement so far provided the products of combustion pass upthrough the flue, around the tube G,within the interior of the cap B,down through the opening 01 into the tube 0, and out through theopenings a or b, or both but when there is no wind the arrangementdescribed somewhat obstructs the draft, and when the wind drives veryfiercely into either the opening a or the open ing b it is apt to drivethe smoke up through 50 the opening d, and so down the flue. To obviatethese difficulties I cut out the top of the cap B over the opening (2and mount upon the opening 6 so formed the cap D, which may be any formof cap having side openings and a sloping and projecting top to protectagainst rain in the usual way. This cap D and opening 6 furnish a secondprotected opening, through which the products of combustion may passfrom the interior of the cap B, and their mode ofcombination with theother parts of the entireimproved chimney-cap insures an unobstructeddraft when no wind is blowing, and a good draft when a heavy wind isdriving directly through the tube 0, for so much of the wind in thelatter case as is forced upward through the opening d will find a directand ready exit through the opening a and cap D, incidentally increasingthe draft in the chimney by suction.

Vhat I claim as new, and desire to secure by Letters Patent, is

As a new article of manufacture, a chimneycap consisting of the cap B,having openings d and c, the transverse tube 0, having openings (0 andb, and the cap D, substantially as and for the purposes set forth.

W. H. KENYON, EDWIN SEGER.

